Boil lasagna
in salted water for 5-7 minutes or till al dente, drain and cool
keep it aside

Heat oil in
pan sauté garlic and onions till translucent,

add the rest
of the vegetables add some water cook for few minute make it
dry Adjust
seasoning

spread tomato
sauce on plate then place lasagna sheet over the tomato sauce,
then vegetables coat with béchamel sauce again pasta sheet
and then vegetable again tomato sauce then cover with lasagna sheet
Coat with béchamel sauce and grated Parmesan cheese and mozzarella
cheese.